Speaking With Colin Firth

TORONTO — When discussing his role in the film “The King’s Speech,” the actor Colin Firth chose his words carefully. The film, which looks back at the relationship between King George VI (Mr. Firth) and his speech therapist, Lionel Logue (Geoffrey Rush), who helped him overcome a debilitating impediment. Here, Mr. Firth discusses how he prepared for the role and how he arrived at the character’s stammer.